/**

     * 获取真实ip地址

     * @param request

     * @return

     */

    public static String getIpAddress(HttpServletRequest request) {

        String ip = request.getHeader("x-forwarded-for");

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("Proxy-Client-IP");

        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("WL-Proxy-Client-IP");

        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("HTTP_CLIENT_IP");

        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("HTTP_X_FORWARDED_FOR");

        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getRemoteAddr();

        }

        return ip;

    }